Tag: chemistry

Quizzes (490) Questions (9892)

Questions Related to chemistry

Multiple choice chemistry the structure of the atom discovery of charged particles the plum pudding atom discovery of electrons and protons

The radius of nucleus is:

  1. proportional to its mass number

  2. inversely proportional to its mass number

  3. proportional to the cube root of its mass number

  4. not related to its mass number
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The radius of a nucleus (r) is proportional to the cube root of its mass number (A).
The approximate law is $r = r _0 \times A^{ 1/3 }$
where $r _0 = 1.2 \times 10^{ -15 }\ m$
option C is correct
Multiple choice chemistry substances in daily use polyester and acrylic rayon and nylon synthetic fibres

Which of the following do not contain polyester fabric?

  1. Terrywool

  2. Terrycot

  3. Terylene

  4. Orlon
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Terrywool, Terrycot and Terylene all contain polyester.


Orlon is a polymer of vinyl cyanide. It is made by the addition of acrylonitrile molecules. It is a brand of the synthetic, acrylic textile fibre of the lightweight and wrinkle-resistant fabric.

Option D is correct.

Multiple choice chemistry substances in daily use polyester and acrylic rayon and nylon synthetic fibres

Polyester consists of :

  1. repeating unit of ether

  2. monomer of ester

  3. repeating units of ester

  4. monomer of ether
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Polyester is a category of polymers that contain ester in their main chain.


 Polyesters are used to make bottles, films, holograms, filters, dielectric film for capacitors, film insulation for wire and insulating tapes.

Hence the correct option is C.